[1]} argue that in one of the model they studied a fraction of \(\simeq 0.2\)  of NS-NS binaries can merge within 1Myr, and that this solves the problem of long delay time in the kilonova r-process scenario. The ratio of early NS-NS merger events to total NS-NS merger events that I found in equation (REF ) is lower by a factor of about 7 than the required early merger rate according to [1]}. This gives a small contribution to the required early merger, but a non-negligible one. I therefore encourage further study of the early merger in the NS-NS merger in CEJSN scenario.
